Set top box



FIG. 1 is a perspective view of a set top box according to our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown on the set top box is included for the purpose of illustration and forms no part of the claimed design. 

The ornamental design for a set top box, as shown and described. 